Achtung Baby...just answer your question. Some sororities that do require recommendations if you don't bring one and they are required by their organizaiton to do this (silly still, but may be useful for some schools), I've seen where the chapter will write one or 'sponsor' you. Does that make any sense?
Ok, I used to work from Tri Delta in Recruitment....and they required recs for women to move on in the process, so if they liked a woman and needed a rec, they have a committee where the chapter or the rec chair writes one or sponsers the PNM.
Just an fyi